Donald Trump is scheduled to undergo his first announced physical exam as president on Friday, just as questions about his health and stability are morphing from whispers in Washington to shouts on cable news.

The shift was set off by Michael Wolff’s sensational new book Fire and Fury, in which the issue of Trump’s mental fitness comes up repeatedly and Steve Bannon raises the prospect that the president’s cabinet could remove him from office by invoking the 25th Amendment. Trump has since only encouraged such conversations, engaging with rumors about his mental condition by protesting on Twitter that he is, in fact, a “very stable genius.”

While his doctor’s appointment is attracting a lot of attention, don’t expect any momentous revelations. The executive branch has a long, proud history of hiding presidents’ debilitating conditions from the American public. If this checkup uncovers anything grave, there’s no reason to expect the Trump White House to be any more transparent than its predecessors have been.

So, rather than wait for new questions about his health to emerge, consider the many vexing mysteries that already exist…

1. What does it mean that the president is “up to date on an H.I.V. test”?

Of the many strange statements that have been made in the past couple years about Trump’s health, perhaps the most question-begging is the assertion by his gastroenterologist, Dr. Harold Bornstein, that he is “sure that Mr. Trump was up to date on an H.I.V. test.”

The statement was printed a year ago, as part of an interview with The New York Times, and it attracted virtually no notice. It’s tough to know why exactly it would be worth pointing out that a married, 71-year-old man had likely undergone recent H.I.V. testing.

We do know that Trump has talked about being careful about sexually transmitted diseases. In 1991, he told the press that before he would begin dating a woman, he would ask her to visit his doctor for an AIDS test. Perhaps he’s simply just stayed in the habit of being concerned about the disease. (Of course, one must presume that any personal concern is likely unrelated to the White House’s surprise move last month to sack every remaining member of the Presidential Advisory Council on HIV/AIDS.)

2. Is the president obese?

In September 2016, Trump appeared on The Dr. Oz Show to discuss his health, listing his weight at 236 pounds and his height as 6’3”.

If accurate, those stats would give the medically overweight Trump a body-mass index of 29.5—just shy of 30, the medical threshold for obesity.

But Trump has never shied away from fudging numbers, and over the years his stature has repeatedly been reported to be an inch shorter, 6’2”. That’s also the height that appears on his New York state driver’s license, which Politico unearthed shortly after Trump won the presidency.

If you take Trump’s self-reported weight at face value and assume he really is 6’2” tall, his BMI is 30.3, making him obese.

But Trump reported that weight two months before the election, or about 5,000 news cycles ago. Since then, he’s apparently gained weight, according to The New York Times, which reported on Tuesday that, as of late, “friends have noticed an increase in his girth.”

So the available evidence suggests Trump—despite deriding plenty of people about their weight, including calling Rosie O’Donnell a “fat pig”—is well into obesity territory himself, putting him at increased risk for a number of health problems. To settle the matter, perhaps a public weigh-in—of the sort boxers perform before a bout—could be in order. Trump’s friend Don King could arrange it.

3. Why does the president believe that exercise is unhealthy?

During last year’s campaign, Trump remarked that giving stump speeches in heavy clothing was all the workout he needed, and indeed, at one point he reportedly lost weight.

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As for more conventional forms of actual exercise, Trump adheres to the astonishing—perhaps unique—belief that it is unhealthy. “All my friends who work out all the time, they’re going for knee replacements, hip replacements—they’re a disaster,” he told The New York Times Magazine in 2015.

This was more than just a passing remark. According to The Washington Post’s 2016 biography, “Trump believed the human body was like a battery, with a finite amount of energy, which exercise only depleted. So he didn't work out.”

It is unclear how Trump arrived at this belief, because, for healthy people, exercising tends to boost energy levels.

4. Is the president afraid of stairs?

During his run for the White House, Trump took on the political establishment, defied the tenets of political correctness, and once even threatened the escaped Mexican drug lord El Chapo.

But beneath all the bravado, Trump still has fears just like anybody else. He has expressed a fear of poisoning, for one. For years, it was reported that he was also afraid of germs—a claim he denied in a 2015 interview with The Hollywood Reporter but later confirmed at a press conference last year. His germophobia, he said, made it impossible to believe the anonymous, unverified claims that he had arranged messy sex acts with prostitutes in a Moscow hotel room.

But does he also fear stairs?

Last January, as he strolled outside the White House with U.K. Prime Minister Theresa May, Trump was seen to reach for her hand. The handholding raised eyebrows, and The Telegraph, relying on an unnamed U.K. government source, reported that the reaction was prompted by an alleged fear of stairs and slopes. The British press ran with this alleged case of presidential “bathmophobia” as fact.

Still, for an alleged bathmophobe, the president regularly walks up and down plenty of stairs without exhibiting any obvious symptoms of terror. Jury’s still out on this one.

5. Why did the president slur his speech last month?

During remarks last month at the White House announcing that the U.S. would recognize Jerusalem as the capital of Israel, Trump’s speech briefly became slurred.

The White House said the president simply had a dry throat. Others have speculated that the lapse could be a sign of anything from faulty dental work to a stroke or other serious nervous-system disorder.

Rather than ask too many questions about this, Americans might just settle for being grateful that the words “President Trump” and “slur” managed to appear in the same sentence without it involving an international incident.

6. Is the president, as he claims, really a “genius”?

Rather than evaluating Trump’s claim that he is “like, really smart,” the issue at hand is more precisely whether—genius or not—he’s losing his edge.

At 70, Trump was the oldest president ever sworn in to office. The next-oldest, Ronald Reagan, showed signs of cognitive decline during his presidency and was later diagnosed with Alzheimer’s, a disease that also afflicted Trump’s father.

So it’s worth noting that an analysis by Stat of 30 years of public statements by Trump found a marked drop-off in the complexity of his off-the-cuff remarks over time, suggesting cognitive decline.

And on the less scientific front, Joe Scarborough claimed this week that a Trump confidant has told him the president is suffering from dementia—though Scarborough and Trump happen to also be embroiled in an ongoing personal feud.

7. Is the president, as he claims, “very stable”?

Last month, Democratic lawmakers—and one Republican senator—invited a Yale psychiatrist to Capitol Hill to offer her take on Trump’s mental health, which in short was “he’s going to unravel, and we are seeing the signs,” Politico reported.

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A dull-witted president would be one thing, but a stark raving-mad one would present bigger problems. And the question of Trump’s mental stability is what’s spurring chatter about the possibility that his cabinet could invoke the 25th Amendment and remove him from office. So is Trump going insane? Or as a rich guy, and the president, does he get to pass as just going eccentric?

As he continues to perform his special mix of nuclear brinkmanship and a kabuki-theater-insult-comedy with North Korean dictator Kim Jong-un, we’re all going to get to find out.

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